Hydrogen injection system of gas turbine and flame stabilizing method

Abstract

The invention discloses a hydrogen injection system of a gas turbine. The system comprises two hydrogen storage tanks. The hydrogen storage tanks are connected with hydrogen injectors, and hydrogen isdirectly injected into a combustion chamber according to the set flow. The two hydrogen injectors include the first hydrogen injector with a nozzle located on the lower part of the side wall of the combustion chamber, and a second hydrogen injector with a nozzle located at the bottom of the combustion chamber. The invention further provides a flame stabilizing method by using the hydrogen injection system of the gas turbine. The method comprises the steps that air and fuel are metered independently, mixed and fed into the combustion chamber, then hydrogen is metered, the hydrogen is directlyinjected into the combustion chamber from the bottom or the side face, and ignition is carried out for combustion. According to the hydrogen injection system of gas turbine and the flame stabilizing method, natural gas and hydrogen are used as fuels, and the directly injected hydrogen accounts for 1% to 5% the total amount of the fuels; by injecting a small amount of hydrogen, the lean burn limitof combustion is further expanded while flame is stabilized, the ignition performance and the combustion efficiency of the fuels are improved, the risks of tempering, self-ignition and thermo-acousticoscillation in the combustion process are reduced, and emission of pollutants such as nitric oxide is limited.

Description

technical field [0001] The invention belongs to the technical field of energy and power, and in particular relates to a hydrogen injection system and a flame stabilizing method of a gas turbine. Background technique [0002] Gas turbines are the most advanced heat-to-power conversion devices. Typical heavy-duty gas turbines for power generation use natural gas as fuel, adopt lean-burn premixed combustion, and have low NOx emissions. Hydrogen is an excellent energy carrier. Green hydrogen energy (referring to hydrogen energy produced by renewable energy) can effectively absorb fluctuating wind energy, light energy, and water energy. Converting fluctuating renewable energy into hydrogen, and then converting it into stable electricity, cooling, and heat output through combustion and fuel cells, is a feasible low-carbon and distributed comprehensive utilization of energy. Compared with traditional hydrocarbon fuels, hydrogen has the characteristics of low ignition energy, fast ...

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Problems solved by technology

[0003] However, due to the active chemical properties of hydrogen, the combustion process of hydrogen-rich fuels is prone to flashback and self-ignition. Although hydrogen-rich fuels have high stability under lean combustion conditions, the hydrogen doping ratio needs to reach a certain amount. There will be a significant effect, and the combustion process of hydrogen-doped fuel is easily affected by thermoacoustic instability, resulting in oscillation; at the same time, due to the high flame temperature of hydrogen, increasing the hydrogen-doped fuel ratio will increase the NO linearly x emission

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